The water supplied to Delhi as well as NCR region is not of good quality. People develop serious diseases if they drink such water for long. According to a research study conducted across the NCR region which include Noida, Gurgaon, Faridabad and Ghaziabad, water supplied in the region is contaminated. The study was conducted by K.M. Johnson, scientist, Eureka Forbes, Institute of Environment.The desirable level of Total Dissolved Solids (TDS) in drinking water is about 500 litre. However, out of the 378 samples collected all across the NCR region, a whooping 91 per cent were found to be over this limit which is a clear indicator of the rising concern.As far as the total hardness of water is concerned, only 29 per cent of the samples were under the desirable limit of 300 litre. When it comes to the chloride levels, up to 26 per cent of the samples were above the desirable limit of 250 litre, similar results were seen in the nitrate levels. Up to 43 per cent of the samples were above the desirable limit when it came to fluoride levels.